I know it's been resolved but this has really upset me - I was the step daughter in this.
My parents split before I can remember and my Dad met a woman with 2 older children and went on to have another child with his new wife. I always hated going there because I was told it was my home, but it didn't feel like it at all, I didn't even have a bed! Just a sleeping bag on the floor every other weekend.
Anyway I always hated going and I suppose they did, and still do, find me very quiet, actually I'm the opposite, I'm very witty and funny in general but even now as an adult if I visit I feel myself retreating and I would never go there now without the support of my husband.
Anyway, by the time I was 9 or so, I'd managed to 'prove' to my Mum how much I hated being there and I wasn't made to go every weekend. With the help of my aunt I wrote a letter to my Dad saying that I didn't want the whole 'family' thing I just wanted to see him. He rang me when he got the letter telling me that it would be unfair on his other biological child (that he lived with) because he had to see them too. Basically he couldn't spare a couple of hours once a month to see me, if I wasn't willing to see them as a family.
I now have a very 'cold' relationship with me father and he still tries to play happy families. Since my teenage years I have seen him once, maybe twice, a year. I think I will eventually go nc, but I'm very close to my paternal grandmother and I don't want to upset her so I do the bare minimum.
I find it very difficult, because he has always been such a good, involved father to his other child (and even step children). Just not me.